Randy,
thanks for your feedback.
1. The help for creating new marker symbols (including a description of the types available) is here:
http://desktop.arcgis.com/en/arcmap/10.3/map/styles-and-symbols/creating-marker-symbols.htm
2. Publishing from Pro doesn't use this codepath, unless you're using an older (2.0/2.1) version of Pro. So if you're experiencing issues after republishing the service from Pro, I would recommend updating Pro to a more current version. The most recent public version is 2.4.
3. You will note that the "roll back the security updates" options do say "...and opt out of updates until the resolution is available". An article which enumerates several ways to opt out of windows updates is linked here for Win10, similar info is available online for other versions: https://www.windowscentral.com/how-stop-updates-installing-automatically-windows-10
The full Kb article is copy-edited and we're pushing it to the web presently.
Regards,
Jeremy W.